feat: 完成 F18 审批规则维护（API+前端）\n\n- 新增 /api/approval-rules 管理接口（system.settings）并写审计\n- 前端新增审批规则页与菜单入口（system.settings）\n- 更新 P5 蓝图 v3 中 F18 状态为 DONE

client/src/router/index.tsx

@@ -2,6 +2,7 @@ import { Navigate, Route, Routes } from "react-router-dom";
 import { AppShellLayout } from "../layouts/AppShellLayout";
 import { AuthLayout } from "../layouts/AuthLayout";
 import { AuditLogsPage } from "../pages/AuditLogsPage";
+import { ApprovalRulesPage } from "../pages/ApprovalRulesPage";
 import { ChangePasswordPage } from "../pages/ChangePasswordPage";
 import { DashboardPage } from "../pages/DashboardPage";
 import { DepartmentsPage } from "../pages/DepartmentsPage";
@@ -138,6 +139,15 @@ export function AppRouter() {
           }
         />
 
+        <Route
+          path="system/approval-rules"
+          element={
+            <RequirePermission anyOf={["system.settings"]}>
+              <ApprovalRulesPage />
+            </RequirePermission>
+          }
+        />
+
         <Route path="settings/profile" element={<ProfilePage />} />
       </Route>